Toán Lớp 5: Bài 3:Tính nhanh a) 76,85 : 0,25+13,15*4. B) 47,54: 0,125+47,54+47,54. C) 89,7:0,5+89,7*3+89,7*5. D)57,24-9,76-18,24-17,24
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Toán Lớp 5: Bài 3:Tính nhanh a) 76,85 : 0,25+13,15*4. B) 47,54: 0,125+47,54+47,54. C) 89,7:0,5+89,7*3+89,7*5. D)57,24-9,76-18,24-17,24
Comments ( 2 )
a/ 361,4
b/ 1140,96
c/8073
d/12
$@Iris$
a)76,85 : 0,25 + 13,15 xx 4
= 76,85 xx 4 + 13,15 xx 4
= ( 76,85 + 13,15 ) xx 4
= 100 xx 4
=400
b)47,54 : 0,125 + 47,54 + 74,54
=47,54 xx 8 + 47,54 xx 2
=47,54 xx ( 8 +2)
=47,54 xx 10
=475,4
c) 89,7 : 0,5 + 89,7 xx 3 + 89,7 xx 5
= 89,7 xx 2 + 89,7 xx 3 + 89,7 xx 5
=89,7 xx ( 2+3+5)
=89,7 xx10
=897
d)57,24 – 9,76 – 18,24 – 17,24
=57,24 – ( 9,76 + 18,24 + 17,24)
=57,24-40,24
=17